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La Terra è molto più verde di quanto si pensi. Gli alberi che la popolano sono infatti otto volte più numerosi del previsto. Oltre 3'000 miliardi contro i poco più di 400 miliardi stimati fino ad oggi.
In pratica ci sono 422 alberi per ognuno dei 7,2 miliardi di abitanti della Terra, contro i 61 calcolati finora. La nuova mappa delle foreste è un vero e proprio censimento, frutto di una collaborazione internazionale guidata dall'università americana di Yale, basato su circa 430'000 misure eseguite in 50 Paesi di tutti i continenti, ad eccezione dell'Antartide. Nella ricerca sono confluiti anche i dati svizzeri.
Secondo l’indagine la presenza dell'uomo si fa sentire pesantemente con 15 miliardi di alberi tagliati ogni anno: un intervento che dall'inizio della civilizzazione ha portato ad una perdita complessiva del 46%.
ATS/lg
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